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In my latest box of circuit board goodies I came across this interesting circuit that has helped revolutionize dentistry.     However, before I get into the function of the board itself, let me digress and give you some back ground on its application. Up until about 20 years ago it was necessary for a dentist to shine light into a patient's mouth from an external light source in order to see what he was doing with his drill. This procedure required very precise positioning of the ex ...
Tonight I am going to describe the repurposing of a power supply board from an obsolete dental X-ray machine. Before I start, however, I want to digress and go back 60 years to the beginnings of my interest and enjoyment of electronics.   The man who got me off to a good start was my Dad. Now you might guess that he was also involved in electronics or at least had an interest in the subject but this is not the case. My Dad had no electronic or mechanical skill whatsoever. If he had any abi ...
jw0752

A Box of Entertainment

Posted by jw0752 Top Member May 14, 2016
Today son Mike, 4ringfan , brought me a box of circuit boards that he had salvaged from out-of-service dental equipment. One of my favorite pastimes is studying an unknown circuit board to see if I can figure it out and find any potentially usable circuit configurations. As you can see I will have many hours of fun ahead of me as I sort through these:     If any interesting components or circuits appear I will be back to tell you about them.   John ...